Q3 Intermittent limp mode - seemingly, when going into low gear


Registered User
Would be interesting to know if anyone had a similar problem to mine.

My 2015 Q3 had developed a problem - it intermittently goes into limp mode, seemingly after engine braking was used where RPM goes slightly above 3k in a more abrupt manner than a gentle gear shift with the clutch. Happened 3 times now - with about 1000 miles / 2 weeks inbetween occurrences.

First time it happened, the computer was scanned immediately by my neighbour, showing codes P008700 (Fuel Rail / System Pressure - Too Low) and P034100 (Camshaft Position Sensor Circuit Range / Performance). The error was cleared, and fuel filter change (as a cheap first fix) was advised. The car restarted just fine, with limp mode gone.

Second time it happened after two weeks. I've then booked the car with a garage, two days in advance. When I came to the garage, there were no errors on the computer, and they couldn't find anything wrong with the car - but I changed the fuel filter as advised by the mechanic when the issue happened first time. The old filter was fine though.

Third time it happened after another two weeks. I brought the car to the garage again next morning to check it, and computer was showing fault 5580 (Oil Pressure Switch Malfunction - P164B00 [096] Intermittent - Not Confirmed).

Every time the car is restarted after limp mode occurred, it drives just fine - until at some point it happens again.

Would appreciate any advice from experts.

Just to add, having the car from brand new, it was nothing but a pain throughout. I am definitely NOT going to consider buying anything Audi or affiliated in the future.


Registered User
Not really, despite having several checks at Audi dealers and Audi specialists. However, the good news is that it didn't show up for several months now, so I suspect the issue was either with fuel at the time, or with temporary blockage which sorted itself out.